我有一个JFrame Principal.java，我放在JComboBox那里尝试从存储客户端名称的 MySQL 表“pessoa”中进行自动建议。如何实现此工作代码：
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package teste;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;
import javax.swing.DefaultComboBoxModel;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
/**
*
* @author Marcio
*/
public class AutoSuggest extends javax.swing.JFrame {
public AutoSuggest() {
initComponents();
final JTextField textfield = (JTextField) jComboBox1.getEditor().getEditorComponent();
textfield.addKeyListener(new KeyAdapter() {
public void keyReleased(KeyEvent ke) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
comboFilter(textfield.getText());
}
});
}
});
}
public void comboFilter(String enteredText) {
List<String> filterArray= new ArrayList<String>();
String str1="";
try
{
String str="SELECT * FROM pessoa WHERE nome LIKE '"+enteredText+"%'";
Class.forName("com.mysql.jdbc.Driver");
Connection con=DriverManager.getConnection("jdbc:mysql://localhost:3306/teste", "root", "");
Statement stmt=con.createStatement();
ResultSet rs=stmt.executeQuery(str);
while(rs.next())
{
str1=rs.getString("nome");
filterArray.add(str1);
}
}
catch(Exception ex)
{
System.out.println("error"+ex);
}
if (filterArray.size() > 0) {
jComboBox1.setModel(new DefaultComboBoxModel(filterArray.toArray()));
jComboBox1.setSelectedItem(enteredText);
jComboBox1.showPopup();
}
else {
jComboBox1.hidePopup();
}
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jComboBox1 = new javax.swing.JComboBox();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jComboBox1.setEditable(true);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(87, 87, 87)
.addComponent(jComboBox1, javax.swing.GroupLayout.PREFERRED_SIZE, 215, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(98, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(108, 108, 108)
.addComponent(jComboBox1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(172, Short.MAX_VALUE))
);
pack();
}// </editor-fold>
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(AutoSuggest.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(AutoSuggest.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(AutoSuggest.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(AutoSuggest.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new AutoSuggest().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JComboBox jComboBox1;
// End of variables declaration
}
到我的 Principal.java 主屏幕。
private void jComboBox1ActionPerformed(java.awt.event.ActionEvent evt) {
final JTextField textfield = (JTextField) jComboBox1.getEditor().getEditorComponent();
textfield.addKeyListener(new KeyAdapter() {
public void keyReleased(KeyEvent ke) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
comboFilter(textfield.getText());
}
});
}
});
}
public void comboFilter(String enteredText) {
List<String> filterArray = new ArrayList<String>();
String str1 = "";
try {
String str = "SELECT * FROM pessoa WHERE nome LIKE '" + enteredText + "%'";
Class.forName("com.mysql.jdbc.Driver");
Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/teste", "root", "");
Statement stmt = con.createStatement();
ResultSet rs = stmt.executeQuery(str);
while (rs.next()) {
str1 = rs.getString("nome");
filterArray.add(str1);
}
} catch (Exception ex) {
System.out.println("error" + ex);
}
if (filterArray.size() > 0) {
jComboBox1.setModel(new DefaultComboBoxModel(filterArray.toArray()));
jComboBox1.setSelectedItem(enteredText);
jComboBox1.showPopup();
} else {
jComboBox1.hidePopup();
}
}